期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.175302
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资金
- NRF of Korea
- MEST [2011-0017527, 2008-0062257, WCU-R32-10045]
- National Research Foundation of Korea [R32-2012-000-10045-0, 2011-0017527, 2008-0061906] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We measure the in-plane distribution of thermally activated vortices in a trapped quasi-2D Bose gas, where we enhance the visibility of density-depleted vortex cores by radially compressing the sample before releasing the trap. The pairing of vortices is revealed by the two-vortex spatial correlation function obtained from the vortex distribution. The vortex density decreases gradually as temperature is lowered, and below a certain temperature, a vortex-free region emerges in the center of the sample. This shows the crossover from a Berezinskii-Kosterlitz-Thouless phase containing vortex-pair excitations to a vortex-free Bose-Einstein condensate in a finite-size 2D system. DOI: 10.1103/PhysRevLett.110.175302
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